RS232/RS485/RS422 to MM/ST Fiber Optic Converter (Industrial) – CommFront
RS422 RS232 RS485 to Fiber Optical Converter Modem
RS-485 Fiber Converter | Door Locks | Access Devices | Access & Intrusion | Door Locks | Honeywell Building Solutions
Amazon.com: Primeda RS485 Data Extenders -1 Bidirectional RS485 to Fiber Optic up to 20Km(12.4mi) | Transmitter and Receiver | for Access Control System : Electronics
CE Serial To Fiber Converter Modem Support RS-485 RS-422 Interface